Fixed image driver history file name (#635)

* Fixed image driver history file name timetamp - now is timstep-beginning

* Added release notes about PR #635 (fixing image driver history filename
timestamp)

Author: yixinmao

docs/Development/ReleaseNotes.md

@@ -20,6 +20,10 @@ To check which release of VIC you are running:
 
 #### Bug Fixes:
 
+1. Fixed image driver history file name timestamp ([GH#635](https://github.com/UW-Hydro/VIC/pull/635))
+
+	After the fix, the timestamp appeared in the image driver output history filename is the beginning time of the time period in the file.
+
 ------------------------------
 
 ## VIC 5.0.0 [![DOI](https://zenodo.org/badge/7766/UW-Hydro/VIC.svg)](https://zenodo.org/badge/latestdoi/7766/UW-Hydro/VIC)

vic/drivers/shared_image/src/vic_init_output.c

@@ -231,25 +231,29 @@ initialize_history_file(nc_file_struct *nc,
     case FREQ_NDAYS:
         sprintf(stream->filename, "%s/%s.%04d-%02d-%02d.nc",
                 filenames.result_dir,
-                stream->prefix, ref_dmy->year, ref_dmy->month,
-                ref_dmy->day);
+                stream->prefix, stream->time_bounds[0].year,
+                stream->time_bounds[0].month,
+                stream->time_bounds[0].day);
         break;
     case FREQ_NMONTHS:
         // If FREQ_NMONTHS -- filename = result_dir/prefix.YYYY-MM.nc
         sprintf(stream->filename, "%s/%s.%04d-%02d.nc", filenames.result_dir,
-                stream->prefix, ref_dmy->year, ref_dmy->month);
+                stream->prefix, stream->time_bounds[0].year,
+                stream->time_bounds[0].month);
         break;
     case FREQ_NYEARS:
         // If FREQ_NYEARS -- filename = result_dir/prefix.YYYY.nc
         sprintf(stream->filename, "%s/%s.%04d.nc", filenames.result_dir,
-                stream->prefix, ref_dmy->year);
+                stream->prefix, stream->time_bounds[0].year);
         break;
     default:
         // For all other cases -- filename = result_dir/prefix.YYYY-MM-DD-SSSSS.nc
         sprintf(stream->filename, "%s/%s.%04d-%02d-%02d-%05u.nc",
                 filenames.result_dir,
-                stream->prefix, ref_dmy->year, ref_dmy->month,
-                ref_dmy->day, ref_dmy->dayseconds);
+                stream->prefix, stream->time_bounds[0].year,
+                stream->time_bounds[0].month,
+                stream->time_bounds[0].day,
+                stream->time_bounds[0].dayseconds);
     }
 
     // open the netcdf file